| 초록 |
Two different types of amine-attached mesoporous silica MCM-41 using 3-aminopropyltriethoxysilane were prepared and investigated for CO2 adsorption. The pore structures and amino group content in these modified silicas were investigated by XRD, FT-IR, TGA, N2 adsorption-desorption and CHN analysis, which confirmed that in all cases the amino groups were attached to the pore surface of mesoporous silica MCM-41. The CO2 adsorption capacity of the adsorbent prepared by grafting method was compared with that of the adsorbent prepared by coating method. The N2 adsorption-desorption analysis showed a considerable decrease of the pore volume and surface area for the amine-attached mesoporous silica MCM-41 samples. The amine-coated mesoporous silica samples showed higher CO2 adsorption capacity than amine-grafted MCM-41. The adsorption-desorption isotherms of CO2 and thermogravimetric analysis of the sorbents showed that these sorbents can be regenerated completely under mild conditions such as those used in pressure swing or temperature swing adsorption processes. |
